working frequency band meaning in Chinese

工作频带

So , we must research and develop a kind of receiver with good expansibility that the working frequency band is wide , and the adaptive capacity of the wave form is strong
所以,必须要研究开发一种工作频段宽,波形适应能力强,可扩展性好的接收机。
This subject aim at designing a linear power amplifer whose output power is 40w for 225 - 450mhz band . but it seems not easy to finish the task because of this power amplifier own unique requirements including high output power , broad working frequency band , high linearity , and flat gain . due to the complexity involved , theoretically several soltuions are derived in the final scheme such as broadband matching technology , power - retreat , power synthesize , automatic power control and negative feedback . in addition , the design will be optimized by eda software and the final test result indicates that our design is successful
本课题的目标是研制一个输出功率为40w的225 450mhz的线性功率放大器。由于该功放要求输出功率大，工作频带宽，带内增益波动小，线性度高，所以其终合设计难度大。鉴于这个原因，在理论设计上笔者采用了宽带匹配、功率合成、功率回退、负反馈、自动功率控制等技术；在实践中精心设计电路，并且配合eda软件仿真，最终达到所要求的指标。